Hi,
I read the description and I'm ready to start asap. I'm a freelancer (not a company) and I hope my English level will satisfy your needs. I think 1-2 days is more then enough to complete updates you mentioned in the description.
I have a lot experience with WP and CSS/SASS/LESS, PHP, JS, HTML please check my portfolio or contact me for any details.
Thanks,
Heorhii (George)